Lifting-jack.



A. J. LANGE. LIPTING JACK.

APPLICATION FILED JULY 22, 1911.

1,010,774. Patented Dec, 5, 1911 ANDREAS J'. LANGE, 0F RACINE., WISCONSIN.

rrrTrnG-J'acx.

To all 'whome't mag/.concerns l Be it known that I, ANDREAS J; LANGE,.a

citizen ofthe United States, and'resident of ,State j ac1ne,.in the `county of Racine and I of Vtriseonsln, `have invented' certain Ynew and usefullmprovements in Lifting-Jacks, andy I do herebydeclarethatf the following is a full`,fcle`ar, andexact description thereo The object of vmy inventionis to provide and construction being such that a pair of oppositely disposed housed and worm,- driven raclrbars are,

to each other, whereby the combined llift.- ing speed of said wor -drivenrack-bars is increased, while at the expansion f' or contraction .without the employment ofdogs or analogous loclrin'gde` vices. v rj f Another object ofthe invention is to'provide means whereby the apparatus may be utilized as a vise.

With the above objects in View the invention consists in certain peculiarities of con-v .structlon and combinatlon of parts as setA forth hereinafter with reference to the accompanying drawings and subsequently claimed.

.In the drawings Figure yl representsa face view of a lifting jack with a portion of its housing removed and having Acertain parts broken away and certain parts in section to more clearly illustrate structural features; Fig. 2, a longitudinal sectionalview of thesame, the section being indicated by line 2 2 of Fig. l; Fig. 3, a cross-section of the lifting jack, the sect-ion bein indicated by line 3-3 of Fig. 1, and Fig. 4;, a detailed view of a modified form of a loadsupporting foot adapted to be used as a substitute for that form of foot shown in Figs. l and 2.

Referring by characters to the drawings, l, 1, represent longitudinally divided members of a rectangular gear-boxforhousing, the members being secured together by suitable bolts 2 which are in threaded engagement with apertured matched lugs with whichA each housing member is provided. Housing member l has a longitudinally arL 'ranged rail 3 that is provided with parallel' channels 8 for the reception of slidable rack-bars 4, 4', the' same being held to their speqicatintf Letters raten." Appneatimfued July 22,1911.

4seats by engage lwith .which the .by the partly dotted line Avision line betweenv the housing members inftersects the'raclfbars atav point where the lendwall recesses a simple, durable, .powerful *and eli'icientvv double-headed lifting-jack, the arrangement' vided; for, th

expanded tand contraoted in opposite directions with relation 5 same timethe' said rack-bars` willihold the load at any point of; adapted toengage Vthe f Serial No. 639,940.

end-walls of ,the housing members arel provided.

1n F ig.v 2, the d1- of the housing members articulate andwalso intersects a journal that isl formedbyy said housing members at an intermediate zjz'ioint,` which journal is proe reception of a transverse p'owensha'ft," Lto vbe hereinafter described.

Patented Dee. 5191'1; o

ment-twith notched recesses l As best indicated Q neend of each rack-bar lprotrudes through the opposite; :end-wall ofthe housing, to each of whichl cured a foot 5, kthe same as shown in Figs. 1 and 2, being in 4the formvof ribbed rectangular plates havingflat faces that are i corresponding at facesof the housing end-wallapwhereby "said faces constitute vise-jaws. The rack.

bars arefurther secured in their rail seats by a metallic strip 5 that 1s secured tothe upper yface of the rail intermediate of its 'channels by suitable screws.

protrudingendsthere is se- L The teeth of the rack-bars 4, fi are faced in opposite directionsand are each arranged to engage Worms 6, 6, respectively the same being dlsposed adjacent to opposite ends of the housing and the rail 3 at this point isY cut away to permit toothed engagement between said rack-bars and worms. Each worm is secured to a longitudinallyl disposed counter-shaft 7 7,', respectively, which shafts are mounted in pairs ofintermediate journalbearings 8, 8, 8, 8', that extend from crossribs of the housinmember 1. One end of each shaft is journaled in a recess that is formed in the adj aeent end-wall of the Ahousing, the opposite end-wall of the housing being provided with similar recesses for the reception ofnnibs 6 worm 6 toy thus form corresponding end journals tothose just mentioned. By this that extend from the arrangement of shaft journals" it is' apparent 1 n that the springing strain to' ,whichthe coun-` ter-shafts are subjected is eifectuirlly resisted, the Worms' togethenv with their shafts beingarranged to rotate'in opposite d1rections. Each counter-shaft also carries a centrally disposed wormewheel 9, 9', the same being respectively meshed with right and left hand worms 9 of a transversely Aarranged power-shaft 10, which `power-shaft is journaled inbearingsgiormed in the sidewalls of the housing members at their divi- 2 mit' Kramers oost sion line,` one end of said shaft being er;- tended beyond the housing andY provided with a hand-crank 11, whereby the power is applied. To add further rigidity to the device, the housing member 1, which constitutes the cap member, is formed with alined longitudinal depressions 12 that impinge against the strut-retaining strip 5'., whereby the saine is relieved of undue strain, the ribs being spaced apart centraliy of the housing to permit rclearance therebetwee for the power-shaft.

When the jack is to be used for lifting Vehicles or the like, one of the flat rack-bar feet 5 is reinoi'ed and a fork 13, as shown in Fig. 4, is substituted therefor, the fork being provided with a socketed boss for the reception of the end of the rack-bar 4. rThe foot 13 is particularly designed to conforin to a vehicle wheel hub, axle, orother rounded member.

lfrom the foregoing description it is apparent that the rack-bars being in the contracted position shown in Fig. 1 can be insei-ted under a load and when power is applied to shaft 10, the worin-gear connections between said rack-bars will cause the housing to climb upon strut 4, while at the saine time strut L1 will travel loutwardly with relation to the housing and thus exert a lifting power upon the load, it being understood that the lower rack-bar Yfoot 5 is resting upon a resisting base, but should the jack be interposed between two loads, the rackbar members would expand in opposite directions equally and this spread the saine apart. By this arrangement although the worin-gear will elevate one of the rack-bars at eeiiipai'atively a low speed, it is evident,

owing to the fact that the two rack-bars are moving in opposite directions that the lifting speed will be increased to comparatively the same speed as an ordinary type of jack. It is also apparent that, owing to the woringear Conner-.tion between the rack-bars, the same will be held in their elevated positions when the lifting power is checked and thus locking dogs or the like are dispensed With.

i l i l son sii-.trams It will also be observed that lthe oppositely disposed feet r5, 5, may be utilized as vise members in conjunction with each other or that either one of said feet may be utilized Vas a vise member in conjunction with the therethrough, longitudinally disposed counter-shafts journaled in the housing, a Worm carried by eachV counter-shaft in juxtaposition to Vopposite ends of said housing for meshed engagement with the rack-bars, and a transversely arranged power-shaft in gear connection with the counter-shafts.

Q. A lifting jack comprising a housing, parallel rack-bars mounted in the housing each haring an end projecting therethrough, feet secured to the rack-bar ends, longitudinally disposed counter-shafts journaled in the housing', a worm carried by each countershat't in juxtaposition lo opposite ends of said housing for meshed engagement with the respective rack-bars, a transversely arranged prayer-shaft journaled in the aforesaid housing. worms carried by the powershaft. and woriii-iilieels carried by the counter-.shafts in ineshed engagement with the power-shaft worms.

ln testimony that l claim the foregoing I have hereunto set my hand at Mil 'aultee 1n the county oi Milwaukee and State of Wiseonsin in thepresenee or two witnesses.

ANDREAS J. L.\NGE.

lVitnesses y MARTN, J. LANGE, Gro. lV. oUNG. 

